Redragon CASTOR K631 HE vs K708Rapid Trigger vs Wireless
Choose the CASTOR K631 HE for Hall Effect switches, Rapid Trigger, and 8,000 Hz polling; choose the K708 for Bluetooth and 2.4 GHz wireless, hot-swapping, and its 75% layout.
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from$39at Redragon
from$39at WhatGeek
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Which one should you get?
Get the
Redragon CASTOR K631 HE
Rapid Trigger
Build quality in the bottom 5% of 65% boards under $50.
- Hall Effect magnetic switches with Rapid Trigger and adjustable actuation.
- 8,000 Hz polling and a vendor-described option to assign two actions to one key.
- Magnetic switches only. Standard MX switches will not fit.
- 65% layout. No function row and no numpad.
Get the
Redragon K708
Wireless
Build quality in the top 20% of 75% boards under $50.
- Bluetooth and 2.4 GHz wireless modes, alongside wired USB connectivity.
- Hot-swap support for 3-pin and 5-pin switches.
- Aluminum case with a TFT screen and control knob.
- No numpad.
Get the CASTOR K631 HE for Hall Effect switches, Rapid Trigger, and 8,000 Hz polling, features not listed for the K708. Choose the K708 for wireless connections, hot-swappable switches, its 75% layout, and aluminum case, which the CASTOR does not offer. If you need a numpad, neither layout provides one.
The differences that matter
Skip the 40-row spec sheet. These are the specs that change how each board feels, sounds, and fits your desk.
Redragon CASTOR K631 HE
Redragon K708
Layout size
65%
75%
Hall effect (magnetic)
Yes
No
Adjustable actuation helps in games and not in normal typing
Rapid trigger
Yes
No
Faster resets help in games and not in normal typing
Connection
Wired
Bluetooth, 2.4 GHz, Wired
Wireless for several devices and wired for lower latency
Hot-swappable
No
Yes
Switch changes without soldering
- Redragon CASTOR K631 HE
- Redragon K708
- Performance
- 9182
- Build quality
- 4279
- Productivity
- 4888
- Customizability
- 4779
- Portability
- 6581
What will you mostly use it for?
The CASTOR K631 HE has the clearer fit for gaming focused on Rapid Trigger, Hall Effect switches, and high polling. The K708 is the more versatile choice for office work, programming, modding, and content creation, with its larger layout, wireless modes, and hot-swap support. Travel is a trade-off: the CASTOR is lighter and more compact, while the K708 can connect wirelessly. Neither model includes a numpad.
Pick the Redragon CASTOR K631 HE
- Hall Effect magnetic switches and Rapid Trigger are aimed at responsive key input.
- Its polling rate is 8,000 Hz, and the vendor describes adjustable actuation and two actions assigned to one key.
- The K708 has linear switches and N-Key Rollover, but no listed Rapid Trigger feature.
Redragon CASTOR K631 HE vs K708 specs
Every tracked spec, side by side. Rows marked with a dot differ between the boards.
15 of 22 specs differ
Redragon CASTOR K631 HE
Redragon K708
Switch options
Hall effect (magnetic)
Rapid trigger
Hot-swappable
Mount style
Sound dampening
Layout size
Layout standard
Ergonomics
Knob
Display
Connection
Max polling rate
USB-C
Case material
Keycaps
Weight
Dimensions
Backlight
N-key rollover
Mac & Windows
Released
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Redragon CASTOR K631 HE vs K708: your questions
The CASTOR K631 HE is the more targeted option for gaming that benefits from Hall Effect magnetic switches and Rapid Trigger. It also lists an 8,000 Hz polling rate, while the K708 is specified with linear switches and N-Key Rollover.
Rapid Trigger is listed for the CASTOR K631 HE, not the K708. The K708 is described as having linear switches, gasket mount, and hot-swap support.
No, the CASTOR K631 HE is limited to magnetic switches, and standard MX switches will not fit. The K708 is hot-swappable and its vendor description specifies support for 3-pin and 5-pin switches.
Yes. The K708 supports Bluetooth and 2.4 GHz wireless connections, as well as wired USB connectivity.
The CASTOR K631 HE has a 65% layout, while the K708 has a 75% layout. Neither has a numpad, and the CASTOR's compatibility notes specify that its layout has no function row.
The CASTOR K631 HE is listed at 638 g and measures 33 x 323 x 107 mm. The K708 is listed at 850 g and measures 43 x 335 x 140 mm.
The K708 is hot-swappable, and its vendor description says it supports almost all 3-pin and 5-pin switch brands. That makes replacing its switches an option without changing the whole keyboard.
Yes, the K708 includes a TFT screen and a knob. Its vendor description says the knob can adjust lighting brightness and volume, and switch lighting modes.
It uses Hall Effect magnetic switches and Rapid Trigger, with vendor-described actuation adjustment and dynamic activation and deactivation. The vendor also describes assigning two different actions to one key at different actuation pressures.
The CASTOR K631 HE is lighter and has smaller listed dimensions, but it is wired only. The heavier K708 offers Bluetooth and 2.4 GHz wireless connections, so the better fit depends on whether compactness or wireless use matters more.
The K708 is listed with sound dampening, and its vendor description specifically mentions Poron and silicone pads at the PCB and positioning plate. The same description says those layers help reduce noise from switch presses.
No. The CASTOR K631 HE's 65% layout and the K708's listed layout both have no numpad.
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